$ 2000 -
Kenyalnd<jfl!s'a*Thalland Sudan » • India »Cc
• Philippines , Iran • •Toiwnn Iraq
• Japan • Venatui
10 20 30 40 50 60 70
PERCENT OF POPULATION IN URBAN AREAS
Figure 2. Per capita GNP and percent of population in urban Source: Table 3.
nature of the fuels used, the equipment used in their consum] local airshed conditions. Whatever the sources, air pollution crease with great rapidity.
Pure water has long been recognized as a kind of resource z tion agriculture, and some mining areas have faced problem supply and potability. Today water is a resource of increasin populations grow, cities become larger and more densely pi water-polluting industries multiply.-borne diseases.